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Can you charge the phone just using a cable connected to the wall charger?
Try a force shutdown by pressing power button and volume up at the same time.Turn it back on.
So the phone can charge when you don't have the dock connected? If that's the case it's obviously the dock that is broken.
I think that this needs to be examined and fixed at a repair center. For more information about how to submit your phone for repair and where, contact your local support team.